Gene Regulation Welcome to your Gene regulation question series Which of the following is true about CRP-cAMP in lac operon regulation CRP-cAMP is a positive regulator of responsive to lactose CRP-cAMP is a negative regulator of responsive to lactose CRP-cAMP is a positive regulator of responsive to glucose I&III None Among the sequences 2, 3 and 4 which base pairing leads to transcription termination Sequence 2 and 3 Sequence 3 and 4 Sequence 2 and 4 Sequence 3 and 3’UTR None Which of the following is true for genes in the operon Each gene has an independent promoter Each gene has its own ribosome binding site All the genes need separate activation All of the above None E. coli can synthesis all essential amino acids True Flase None Promoter of a gene is required for Transcription termination Transcription initiation Binding of DNA polymerase to the DNA Splicing site None Choose the correct sequence of the events as per the progression of the expression of the lac operon. A. Expression of I geneB. Expression of lac operonC. Binding of lactose to the repressorD.Binding of lac repressor to the operator of lac operon ABCD BCAD ADCB ADBC None How does lactose promotes the expression of lac operon By inhibiting the expression of the glycolytic genes By binding to the promoter of the lac operon By binding to the lac repressor Inducing expression of gene I None What are aptamers Oligonucleotides Oligopeptides Oligosaccharides Multi-protein complex None Why trp operon mRNA has low half life High concentrations of intracellular RNases To rapidly respond to changing needs of the amino acids. Translation of that mRNA is not required for longer time None of the above None Which of the following is a most abundant protein found in bacteria? DNA repair proteins DNA polymerase Elongation factors 1,5 bisphosphate carboxylase/oxygenase None Cellular concentration of different housekeeping genes vary widely True False None Which of the following phenomenon may occur when repressor molecule binds to signalling molecule? Increase in the rate of transcription Decrease in the rate of transcription Halting transcription Transcription process stays unaffected I and II None Time's up
